This is a bug in how DocumentServices uses Laserfiche.Imaging. Laserfiche.Imaging calls into Windows Presentation Foundation (WPF) when annotations are requested. WPF has a window handle leak under certain conditions, which causes it to error out when the maximum number of windows are created. I wasn't able to reproduce the issue exporting just 1000 documents, but it does manifest itself if i run this workflow a few times.

We are looking into fixing it, but the fix is non-trivial and a hotfix is not possible at this time.

As a workaround, you can switch to using LFSO90 and DocumentProcessor90 to export documents. These libraries do not call into WPF, so the issue will not occur. Both files are installed with Workflow, and they'll continue to be installed in newer versions, so you won't have to worry about these scripts during upgrades. One thing to note is that they are COM libraries rather than .Net assemblies, so the export will be slightly slower due to the added .Net/COM communication.

I'm attaching the modified script. You will need to:

• Add references to Interop.LFSO90Lib.dll, Interop.DocumentProcessor90.dll
• Change "public class Script1 : RAScriptClass92" to "public class Script1 : SDKScriptClass90"

namespace WorkflowActivity.Scripting.SDKScript
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Data.SqlClient;
    using System.Text;
    using LFSO90Lib;
    using DocumentProcessor90;
    using System.IO;
    using System.Drawing;

    /// <summary>
    /// Provides one or more methods that can be run when the workflow scripting activity is performed.
    /// </summary>
    public class Script1 : SDKScriptClass90
    {
        /// <summary>
        /// This method is run when the activity is performed.
        /// </summary>
        protected override void Execute()
        {
            String sMasterLogLocation = "C:\\EXPORT_LFSO\\LOG_"+DateTime.Now.ToString("yyyyMMdd") + ".txt";
            try
            {

            LFDocument doc = (LFDocument)this.Entry;

            string sChannel = "VAL";
            string sAppNumber = TokenReplace("RetrieveFieldValues_Document");
            string sDocCreationTime = doc.CreateDate.ToString("yyyyMMddHHmmss");
            string sDocCreationDate = doc.CreateDate.ToString("yyyyMMddHH");
            int nEntryID = doc.ID;
            string sFileName = sChannel + "_" + sAppNumber + "_" + nEntryID + "_" + sDocCreationTime;
            DocumentExporter docExporter = new DocumentProcessor90.DocumentExporterClass();
            string sFilePath = "C:\\EXPORT_LFSO\\" + doc.CreateDate.ToString("yyyy") + "\\"+ doc.CreateDate.ToString("MM") + "\\" +
            doc.CreateDate.ToString("dd") + "\\" + doc.CreateDate.ToString("HH");
            if (!System.IO.Directory.Exists(sFilePath))
            {
            System.IO.Directory.CreateDirectory(sFilePath);
            }
            string sTempFileName = sFilePath+"\\"+sFileName + ".tif";
            string sFolderLogLocation = sFilePath + "\\LOG_" + sDocCreationDate + ".txt";
            //Export
            //IDocumentContents doc2 = doc.GetLatestVersion();


            LFDocumentPages dpages = (LFDocumentPages)doc.Pages;
            // Marks page to be exported.
            dpages.MarkAllPages();
            // Instantiates a new document exporter.
            DocumentExporter DocE = new DocumentExporter();
            // Adds the marked pages to the document exporter.
            DocE.AddSourcePages(dpages);
            // Specifies the format for the exported document.
            DocE.Format = Document_Format.DOCUMENT_FORMAT_TIFF;
            DocE.BlackoutRedactions = true;
            // Exports the document.
            DocE.ExportToFile(sTempFileName);
            // Clears unused handles.
            doc.Dispose();

            }
            catch (Exception ex)
            {
            WriteLogs(ex.ToString(),sMasterLogLocation);
                WorkflowApi.TrackError(ex);
            }
            }
            public void WriteLogs(string sLog, string sLogLocation)
            {
            StreamWriter sw = new StreamWriter(sLogLocation, true);
            sw.WriteLine(DateTime.Now.ToString("yyyyMMddHHmmss") + "||" + sLog);
            sw.Close();
            }
            }


}